SU240830A1 - AUTONOMOUS SYSTEM GENERATOR — ENGINE ON AC VARIABLE CURRENT - Google Patents

Description

The invention can be applied in those branches of the national economy where autonomous pumping installations are required that operate in 3 wide ranges of modes, for example, with wind engines.

According to the main author. St. No. 230958 is known in the second-generation alternator-motor system.

The proposed autonomous system is characterized in that it contains capacitors interconnected in a triangle and connected to the stator winding of the generator in parallel with a rectifying device that supplies the excitation winding of the generator.

This makes it possible to increase the range of stable operation of the system at variable speed of rotation of the prime mover, improve the starting properties of the generator at low speed of rotation of the prime mover and increase the efficiency. and system power factor.

The drawing shows a diagram of the proposed autonomous generator-motor system for driving the pump.

The primary motor / transmits rotation to a three-phase synchronous generator 2, the stator winding of which is connected to the stator winding of the induction motor 3, which drives the pump 4. The zero reference point of the generator 2 includes a rectifier 5 assembled in a three-wavelength circuit on diodes with low internal resistance and excitation winding 6. To the input terminals of the rectifier 5 is connected

triangle tanks 7.

When starting the prime mover, self-ejection of the generator with the asynchronous motor turned on is provided with residual emf. and the load current caused by it flowing through the rectifier and the excitation winding.

The generator is selected with a margin of reactive power and ampere turns. With a high speed of rotation of the prime mover and

The capacitor resistance is small to the generator frequency, and the load current flowing through this resistance, in addition to the excitation winding, is significant, which prevents the generator and motor windings from overvoltages. The selection of the capacitance value and the parameters of the excitation winding provides the nominal voltage of the generator at the calculated rotational speed of the prime mover. At low speed

the primary motor has a low capacitance effect; in the supply of reactive power and ampere turns it allows to increase the excitation current and voltage of the generator compared to the known autonomous system

This ensures that the generator starts at low speeds of the primary engine, increases the range of stable operation of the pump unit at a variable speed of rotation of the primary engine of the autonomous system and improves its energy performance (power factor and efficiency).

A change in the rated power of the pump drive motor and the degree of its load does not require a change in the parameters of the generator excitation winding. The design mode of the generator can be provided by changing the capacitance value without degrading the generator’s energy performance (efficiency, power factor), since this is not related to the introduction of active resistance connected in parallel to the field winding and loss of power, or with the introduction of successive inductances that degrade the power factor of the generator.

Subject invention

Autonomous system generator - alternating current motor by bus. St. No. 230958, characterized in that, in order to increase the range of stable operation of the system at variable speed of the primary engine, improve the starting properties of the generator at low speed of rotation of the primary engine and the energy performance of the system, to the stator winding of the generator parallel to the excitation winding fed through the rectifier , capacitances are connected, which are interconnected by a triangle.